CO and CO2 methanation over Ni catalysts supported on CeO2, Al2O3 and Y2O3 oxides

Methanation of carbon oxides (CO and CO2) was studied over Ni-based catalysts supported on CeO2, Al2O3, and
\nY2O3 oxides. Catalysts were synthesized by solution combustion synthesis and characterized by N2-physisorption,
\nXRD, H2-TPR, TEM, CO-chemisorption, UV–vis DRS, XPS, and CO2-TPD. The effect of reaction temperature
\n(250−500 °C) was investigated under atmospheric pressure, space velocity (GHSV) of 10,000 h−1, and stoichiometric
\nreactants ratio of (H2-CO2)/(CO+CO2)=3. It can be concluded that the nature of Ni-support interactions
\nplayed a crucial role in enhancing CO and CO2 hydrogenation at low reaction temperature. Ni/CeO2
\ncatalyst deactivated rapidly due to coke deposition, while the formation of NiAl2O4 spinel explained the lower
\nactivity of the Al2O3-supported system. Activity data for Ni/Y2O3 catalysts were closely related to the degree of
\nNi dispersion as well as to the medium-strength basicity. Good anti-coking and anti-sintering ability were observed
\nafter 200 h of lifetime test.